Roasting-furnace shaft.



H. H. STOUT. ROASTING PURNACE SHAFT.

` APPLIUATION FILED APR25, 1913.

l Pane'ntednee. 1:, 1914.v

aan;

WWW/#WWW Cim@ time they are freelto move longitudinally independently of outer wall. The walls so positioned form anzgaxial passage 9 within the tubular inner waljl and the annular passage. 10 between the ,inner and outer walls.

At the places at which rabble arms are to be fastened to the arias, the outer wall is suitably conformed't'o coperate with fastening devices 4for said arms, such conformationsv as shownl including a flanged boss llprojecting outwardly from a re' cessed portion 12 of the wall, the recess being such that the outwardly projecting boss l axial passage 9 and a passage of said rabble Iso arm. f

The tubular connections 15 are joined to the inner wall 4 by bolt-and-nut fastening devices 17 passing through bblt holes in said connections and said wall. ,i The bolt holes in one or both of said joint members are larger than 'ithe Shanks oj'f the\b'oilts, as

shown partifularly in Fig] 4 of tl drawings, so that `he members may mov'e li/ghtly longitudinalygindependently of ea other although Vthey.A are firmly held Vagainst independent Aradig'r'lmovement and forni influidtight joint. f l ,'l l

To increasethe tightness thejjint suitable packingqas asbestos ce/Ine'nt be inserted-in a suitable grooyeproyidedfin the face of the tubular connection-arid surrounding the passage 14.

n the device shown, the shaft sections are articulated together in axial alinement, the outerwalls 3 of' adjacent sections abutting each other at their ends whereby fthe annular 'passages 10 of the sections 'are in communication with each other. vThe bolts 1 coperating with the flanges 2 o f the sections insure such a close contact between the sections as to prevent leakage. The inner walls of the sections are in substantial alinement with each other so that the axial passages 9 of the sections communicate'with each other, the connection ofthe v,sections being such as to prevent substantial leakage but allow longitudinal movement of the inner wall 'of each section independentl of the outer -w'all thereof or of the walls o the other sections. i

In the operation ofthe furnace, a cooling medium, preferably air at ordinary-temperature is induced or forced throughtheaxal the ends. Of the Outelnwau ser@ ft-m 'aannam passage 9 and the various passages 11i-into the rabble arms; after traversing passages in the arms it is discharged therefrom through the passages 13 into the annular passage 10 from which it may escape into the atmosphere. In traversing the arms the air takes up heat therefrom, thus cooling the same, and the thus heated air is then conducted into the annular passage 10. It will readily be understood rthat the inner passage 9 of the shaft contains air'at ordinary temperature, and the annular passage 10 contains air at a considerably higher -temperature, while the gases externally of the shaft Yhave an extremely high temperature due to combustion uponthe hearths of the furnace. The temperature vin the passage'9 may be to 100o F., in the passage 10, 200 to 400 F. and. externally of the lshaft 11000 to 1600o F. It will be seen therefore that the inner'wall 4 is ofa much lower temperature than the outer wall 3; consequently lnactua'l use of the furnace they will expand unequally. The slidable connections between the walls 4 and the rings 6 will permit such expansion at the end portions of said walls without injury of any kind to the shaft. The slidable connections between the tubular projections 15 and the inner wall will allow such expansion atthe places of communication between the axial passage 9 and passages ofthe rabblearms, likewise without injury of any kind. The inner wall is held in position at no point by connections other than slidable ones so'that the outer and inner walls are free throughout their lengths for relative movement longitudinally of the shaft. i

Iclaim: 1. A shaft comprisin tubular, apertured walls spacedapart, a tu ular connection extending 'betweensaid walls and connecting said apertures, and means for joiningsaid tubular connection and'one of said walls whereby said walls may .move longitudinally relatively to each other. y I

12. A shaft comprisin vtubular,"apertured walls spaced apart, a tu ular connection-extending between said walls and connectn sarid apertures,` and means. for joining sai tubular connection and one of said walls,

said means-`-I com risingua -boltfextending through alined; oit-holes in said joined members and 'a nut.- coperating with said of-slightmovement longitudinally independ-V ently of each other.

shaft` .comprising .articulated :sections, each sectoncomprising-an outer wall, s o adjoining Secan. innere-.wall

Einner walls being a ertured, a tubular conniy hand in the presence of two subscribing nection extending etween said walls and witnesses connecting sald apertures, and means for joining said tubular connection and one of HARRY H STOUT' 5 said walls, whereby said walls may move Witnesses:

longitudinally relativel to each other. FRITZ ZIEGLER, J r.l

In testimony whereo I have hereunto set JOHN A. FERGUSON. 

